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tl;dr: A security vulnerability was found in pretty much every version of Unity Engine from 2017 to the pre-patch version of 6.2 today. The issue is in the runtime, so it affects games and applications built with Unity. Windows, Mac, Linux, Android, etc are all affected. There are no reported exploitations of the vulnerability at the current time of writing but this will change rapidly now its been announced. Windows Defender will detect and block the vulnerability, and Valve are adding additional protections to Steam. If you've built anything that you've put out there, patch it.
Post on Unity's discussion board going into more detail.